Abstract Restoration of degraded saltmarshes has attracted global attention, which makes disentangling the factors that determine target species success critically important. The pioneer plant Scirpus mariqueter in the Yangtze River estuary saltmarshes is rapidly declining due to plant invasion. It needs to be protected and restored, but the effects of environmental factors and propagule types on its restoration success are unclear. We examined the environmental niche of three propagule types (seedlings, corm shoots and plantlets) of Scirpus mariqueter under water level, salinity and nitrogen treatments in a greenhouse experiment. We found that water level was the most critical environmental factor limiting plant performance, followed by salinity. Nitrogen addition inhibited propagule growth in intermediate water level and salinity treatments. There were significant three-way interactions between water level, salinity, and nitrogen addition: Scirpus mariqueter performed best in treatments of low salinity + low to intermediate water levels + high nitrogen. Corm shoots outperformed plantlets and seedlings. Our results suggest that planting corm shoots under intermediate salinity and high water level conditions will enhance the restoration success of Scirpus mariqueter in the saltmarshes of the Yangtze River Estuary.

中文翻译：

---

繁殖体类型和环境胁迫在盐沼植物恢复中很重要

摘要 退化盐沼的恢复引起了全球的关注，这使得厘清决定目标物种成功的因素变得至关重要。由于植物入侵，长江口盐沼中的先锋植物Scirpus mariqueter正在迅速减少。它需要保护和恢复，但环境因素和繁殖体类型对其恢复成功的影响尚不清楚。我们在温室实验中检查了 Scirpus mariqueter 在水位、盐度和氮处理下的三种繁殖体类型（幼苗、球茎芽和小苗）的环境生态位。我们发现水位是限制植物性能的最关键的环境因素，其次是盐度。在中等水位和盐度处理中，氮添加抑制了繁殖体的生长。水位、盐度和氮添加之间存在显着的三向相互作用：Scirpus mariqueter 在低盐度 + 中低水位 + 高氮处理中表现最佳。球茎芽优于小苗和幼苗。我们的研究结果表明，在中等盐度和高水位条件下种植球茎枝条将提高长江口盐沼地鲭鱼的恢复成功率。